EHF Flashcards
• Nomenclature of EHF terminal?
USC-38(v)2
• List 7 things required to bring up EHF?
Timing, Crypto, Navigation, Ephemeris Data, Adaptation Data, Dry Air, Chilled Water
• What should the status of the HPA display when in IDLE?
From HPA Dummy Load means no TX.
• What are the black keys and their classification?
Unclas ; TAC-1, Cover, & Downlink.
• What is TAC 1 used for?
Allows access to satellite beams. Cover? Privilege level used to control satellite and communication functions . Downlink? Common to all satellite beams
• What is the red unique key used for?
Encrypts the black keys
• What are the red operational keys?
EHF SKL KEYS
• Describe the differences between loading black keys and red operational keys?
Red operational keys are already encrypted , Black keys need the RED UNIQUE to encrypt them.
• What navigational inputs are required?
Lat/Long: Manually entered, Heading: SINS(Shipboard Internal Navigation System)(WSN-7),Speed: Manually entered ,Pitch/Roll: SINS (WSN-7)
• What is A-data?
Adaptation Data
What is System-data?
Defines which satellites are out there and which ones you can join.
What is Terminal-data?
Gives ships specific Terminal ID (BHR is 2489) and defines block zones for the ship.
• What is E-data?
Satellite position and velocity, Good for 42 days on MIL*, Will update on its own if the satellite is acquired, May still acquire if stale but may take longer.
• How do you format A-data and E-data?
Delete all Misc. letters until it looks like EHF Handbook.
• What type of cooling is used for EHF?
Chilled Water
• List EHF antenna and locations?
Two AS-4294; On top PRIFLY, On SPN-35 platform.
• How many gyros per antenna?
2
• How many LDR ports are there? MDR?
There are 12 Ports for LDR. 4 Prim. W/max 2400bps, 4 Sec. W/max 300bps, 4 RCV ports W/max 2400bps. There are 16 ports for MDR.
• What beam is used for LDR?
Uses Earth Coverage beam W/ a 17.5˚ wide beam which covers 4000 NM; Which provides Network & PTP W/ Data and Voice.
• What is required before you can acquire MDR?
LDR
• What type of MDR beam would we use?
Uses Nuller Spot Beam & Distributed User Coverage Antenna. NSB is 1˚ wide (400 NM), and DUCA is 1˚ wide (400 NM). Services Provided are; Dual Simplex for IP services, Voice Nets or PTP calls at 2400 bps, TIP (TMDA Interface Processor) for IP services.
• What does XMT/RCV; XMT/RCV mean?
We are up on LDR/MDR.
• List CCI for EHF?
KYV-5, KIV-7M, KGV-11.
• What does the KYV-5 limit the data rate to?
2400.
• What are MDR ports 15 and 16 used for?
15 = DSVT, 16 =T1…These are both not used by us.
• What does DUCA stand for? NSB?
Distributed User Coverage Antenna & Nueller Spot Beam
• Where can you find a list of all Terminal ID’s?
EHF Handbook
• What type of multiplexing does EHF use?
Time Division Multiple Access
• How many LDR timeslots are there?
7
MDR?
237
• For an LDR voice net, what do you need to know about timeslots for all users on the net to communicate?
Can’t let it auto select if ARG wants to communicate, If you use timeslot 7, you will be allocating all the data to one circuit.
• What is an ESP and what information is on it?
EHF Service Plan
• What is ATIP?
Advanced TDMA Interface Process
• What is special about the data rate for CT TIP?
When more than one person is on the net, the bandwidth is allocated equally.
